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Etalon (satellite)
Etalon is a pair of Russian passive geodetic satellites, Etalon-1 and Etalon-2, launched in 1989 with GLONASS satellites and covered in corner-cube retroreflectors for satellite laser ranging.
ETCCDI indices
ETCCDI indices are a standardized set of 27 climate extremes indices for temperature and precipitation, so that extreme-event statistics from different countries and climate models can be compared directly.
Eternal inflation
Eternal inflation, or the inflationary multiverse, is a class of cosmological scenarios in which exponential expansion never ends everywhere, continuously producing bubble or pocket universes; our observable universe would be one of them.
Etesian
The Etesians, known in Greece as the Meltemi, are persistent northerly winds that blow over the eastern Mediterranean and especially the Aegean Sea from May through September.
ETFE
ETFE (ethylene tetrafluoroethylene), sold as Tefzel, is a tough, melt-processable fluoropolymer used as lightweight transparent foil cushions on stadiums and botanical gardens, for wire insulation, and in chemical equipment.
Ethacrynic Acid
Ethacrynic acid, also called etacrynic acid and sold as Edecrin, is a loop diuretic that inhibits NKCC2 and treats edema from heart failure, liver cirrhosis, and kidney disease.
Ethambutol
Ethambutol (EMB) is a first-line bacteriostatic antibiotic used in combination regimens for tuberculosis and Mycobacterium avium complex lung disease; its main toxicity is optic neuritis, which can cause irreversible blindness.
Ethane
Ethane (C2H6) is a colorless, odorless, highly flammable alkane gas, the second-simplest after methane, recovered from natural gas and consumed almost entirely as a petrochemical feedstock for producing ethylene.
Ethanethiol
Ethanethiol, commonly called ethyl mercaptan, is the sulfur analog of ethanol, a flammable liquid boiling near 35 °C with a skunk-like odor detectable at about 1 ppbv.
Ethanol
Ethanol, also called ethyl alcohol or grain alcohol, is a clear, flammable liquid alcohol, the intoxicating ingredient in alcoholic beverages and the dominant biofuel blended into gasoline.
Ethanol extraction
Ethanol extraction is a solvent-extraction method that uses ethanol, often mixed with water, to dissolve target compounds such as cannabinoids, terpenes, and flavonoids out of plant material.
Ethanolamine
Ethanolamine, also called monoethanolamine (MEA) or 2-aminoethanol, is the simplest amino alcohol, a viscous liquid best known as the benchmark solvent for scrubbing CO2 from industrial gases.
Ethenolysis
Ethenolysis is a catalytic cross-metathesis reaction with ethylene that cleaves internal carbon–carbon double bonds to convert long-chain or cyclic alkenes into shorter terminal olefins, used industrially to make bio-based chemicals like 1-decene from rapeseed methyl ester.
Ether
An ether, also called an alkoxyalkane, is an organic compound with two organic groups bonded to the same oxygen atom, R–O–R′; ethers are largely inert and widely used as reaction solvents.
Ether peroxides
Ether peroxides are unstable, shock-sensitive peroxide compounds that form spontaneously when ether solvents such as diethyl ether, THF, and dioxane react with oxygen, concentrating dangerously during distillation.
Ethiopian calendar
The Ethiopian calendar, also called the Ge'ez calendar, is Ethiopia's official solar calendar, with 13 months and a year count running 7 to 8 years behind the Gregorian.
Ethiopian units of measurement
Ethiopian units of measurement are traditional local units for grain, land, and household goods, still used in rural markets despite the metric system, Ethiopia's legal system since 1963.
Ethnographic interview
An ethnographic interview is an open-ended, conversational interview used in the social sciences to understand a group's culture and lived experience from the members' own point of view.
Ethnographic photography
Ethnographic photography is the use of photographs to document, study, and represent cultures, practiced within anthropology since the 1860s and developed by figures like Franz Boas and Alfred Cort Haddon.
Ethosuximide
Ethosuximide, sold as Zarontin, is a succinimide anticonvulsant first synthesized in 1927 and introduced in 1958, used to treat absence seizures and ineffective against tonic-clonic seizures.
Ethyl acetate
Ethyl acetate, also known as ethyl ethanoate or EtOAc, is a clear, flammable ester of acetic acid and ethanol used as a solvent in coatings, inks, and adhesives.
Ethyl acetoacetate
Ethyl acetoacetate (Acetoacetic acid ethyl ester, diacetic ester) is a colorless, fruity-smelling β-keto ester liquid, the classic starting material of the acetoacetic ester synthesis for making substituted methyl ketones.
Ethyl acrylate
Ethyl acrylate is the ethyl ester of acrylic acid, a colorless, volatile liquid monomer used to make acrylic polymers for latex paints, adhesives, textiles, paper coatings, and acrylic fibers.
Ethyl butyrate
Ethyl butyrate, also known as ethyl butanoate, is a clear colorless ester with a strong pineapple-like odor, widely used as a flavoring agent in food and beverages.
Ethyl carbamate
Ethyl carbamate, also called urethane, is the ethyl ester of carbamic acid, a probable human carcinogen that forms as a contaminant in fermented foods and alcoholic beverages.
Ethyl cellulose
Ethyl cellulose (E 462) is a water-insoluble cellulose ether made from wood pulp or cotton, used as a coating agent, binder, and stabilizer in pharmaceuticals, foods, and feed.
Ethyl cinnamate
Ethyl cinnamate is the ethyl ester of cinnamic acid, a liquid with a balsamic, cinnamon-like, fruity odor that occurs naturally in some plants and is used almost entirely as a flavoring agent and fragrance material.
Ethyl cyanoacetate
Ethyl cyanoacetate (ethyl 2-cyanoacetate) is the ethyl ester of cyanoacetic acid, a colorless liquid used as an intermediate for cyanoacrylate adhesives, drugs such as trimethoprim and vitamin B6, and dyestuffs.
Ethyl formate
Ethyl formate, also known as ethyl methanoate, is the ethyl ester of formic acid, a flammable liquid with a fruity, rum-like odor used as a food flavoring.
Ethyl lactate
Ethyl lactate, also known as lactic acid ethyl ester, is the ester of lactic acid and ethanol, used as a biodegradable green solvent and food flavoring agent.